ios系统下删除文件的代码

03415

方法一：这段objective c代码用于删除指定路径的文件

1
2
3
if ([fileManager removeItemAtPath:@"FilePath" error:NULL]) {
   NSLog(@"Removed successfully");
 }

方法二：

1
2
3
4
5
NSFileManager *defaultManager;
defaultManager = [NSFileManager defaultManager];
[defaultManager removeFileAtPath: tildeFilename
handler: nil];

handler可以接收消息，比如如果删除失败，可以使用fileManager:shouldProceedAfterError: 。

方法三：

IOS 删除文件 删除文件夹 创建文件 创建文件夹 判断文件存在 md5 封装类

自己最近在使用关于数据的存取和删除，于是自己就写了一个包括功能的类，自己用着还是蛮方便，再次分享一下

StorageData.m

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
//
// StorageData.m
// xunYi7
//
// Created by david on 13-6-28.
// Copyright (c) 2013年 david. All rights reserved.
//
#import <CommonCrypto/CommonDigest.h>
#import "StorageData.h"
#import "xunYi7AppDelegate.h"
@implementation StorageData
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
  NSLog(@"开始结didReceiveData搜数据");
}
-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
  NSLog(@"开始结didReceiveResponse搜数据");
}
-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
  NSLog(@"didFailWithError");
}
-(void) connectionDidFinishLoading:(NSURLConnection *)connection{
  NSLog(@"connectionDidFinishLoading");
}
+(NSMutableData *)remoteFetchData:(NSString *)dataUrl{
  NSString *currentDataFilePath = [[self dataPath] stringByAppendingPathComponent:[self fetchTodayDate]];
  
  //创建目录
  currentDataFilePath = [self createDirectory:currentDataFilePath];
  
  currentDataFilePath = [currentDataFilePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist",[self md5:dataUrl]]];
  
  if([xunYi7AppDelegate isReachable]){
    NSURL *url = [[NSURL alloc] initWithString:dataUrl];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url
                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                         timeoutInterval:60];
    
    NSURLResponse *response = [[NSURLResponse alloc] init];
    NSError *receiveDataError = [[NSError alloc] init];
    
    NSMutableData *receivedData = (NSMutableData *)[NSURLConnection sendSynchronousRequest:request
                                       returningResponse:&response
                                             error:&receiveDataError];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    
    return receivedData;
  }else{
    [xunYi7AppDelegate showNetworkMessage];
  }
  return nil;
}
+(NSMutableData *)localFetchData:(NSString *)dataUrl{
  
  NSString *currentDataFilePath = [[self dataPath] stringByAppendingPathComponent:[self fetchTodayDate]];
  NSString *yesterdayDataFilePath = [[self dataPath] stringByAppendingPathComponent:[self fetchYesterdayDate]];
  
  //创建目录
  currentDataFilePath = [self createDirectory:currentDataFilePath];
  
  currentDataFilePath = [currentDataFilePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist",[self md5:dataUrl]]];
  yesterdayDataFilePath = [yesterdayDataFilePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist",[self md5:dataUrl]]];
  
  NSMutableData *localData = [self fromFilenamePathFetchLocalData:currentDataFilePath];
  
  if(localData != nil){//本地数据
    return localData;
    
  }else{//远程获取数据
    
    NSMutableData *receivedData = [self remoteFetchData:dataUrl];
    
    if(receivedData != nil){
      if([self storageDataToFile:receivedData fileName:currentDataFilePath]){
        NSLog(@"保存成功");
        [self removeDirectory];
      }else{
        NSLog(@"保存失败");
      }
    }else{
      if((localData = [self fromFilenamePathFetchLocalData:yesterdayDataFilePath]) != nil){
        return localData;
      }
    }
    return receivedData;
  }
  return nil;
}
//md5加密字符串
+(NSString *)md5:(NSString *)str{
  const char *cStr = [str UTF8String];
  unsigned char result[16];
  CC_MD5(cStr, strlen(cStr), result); // This is the md5 call
  return [NSString stringWithFormat:
      @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
      result[0], result[1], result[2], result[3],
      result[4], result[5], result[6], result[7],
      result[8], result[9], result[10], result[11],
      result[12], result[13], result[14], result[15]
      ];
}
//上传图片存储
+(void) saveUploadImage:(UIImage *)image withName:(NSString *)imageName{
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  NSError *error;
  
  // 获取沙盒目录
  NSString *fullPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
  fullPath = [fullPath stringByAppendingPathComponent:@"tmpImage"];
  if(![fileManager fileExistsAtPath:fullPath]){
    [fileManager createDirectoryAtPath:fullPath
        withIntermediateDirectories:YES
                attributes:nil
                   error:&error];
  }
  
  fullPath = [fullPath stringByAppendingPathComponent:imageName];
  NSData *imageData = UIImageJPEGRepresentation(image, 0.5);
  
  // 将图片写入文件
  [imageData writeToFile:fullPath atomically:NO];
}
//上传图片删除
+(void) removeUploadImage:(UIImage *)image withName:(NSString *)imageName{
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  NSError *error;
  
  // 获取沙盒目录
  NSString *fullPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
  fullPath = [fullPath stringByAppendingPathComponent:@"tmpImage"];
  if(![fileManager fileExistsAtPath:fullPath]){
    [fileManager removeItemAtPath:fullPath error:&error];
  }
}
//获取存储的图片
+(NSString *)fetchUploadImagePath:(NSString *)imageName{
  NSString *fullPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
  fullPath = [fullPath stringByAppendingPathComponent:@"tmpImage"];
  fullPath = [fullPath stringByAppendingPathComponent:imageName];
  return fullPath;
}
//判断文件是否存在
+(NSString *)isFileExists:(NSString *)fullpath{
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  if([fileManager fileExistsAtPath:fullpath]){
    return fullpath;
  }
  return nil;
}
//+(void)
//获取存储文件的目录
+(NSString *)dataPath{
  //此处首先指定了图片存取路径（默认写到应用程序沙盒 中）
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
  
  //并给文件起个文件名
  NSString *filePathDerectory = [paths objectAtIndex:0];
  
  return filePathDerectory;
}
//获取指定文件的数据
+(NSMutableData *)fromFilenamePathFetchLocalData:(NSString *)filename{
  //保存数据到指定文件中
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  if([fileManager fileExistsAtPath:filename]){
    NSData *data = [fileManager contentsAtPath:filename];
    return [data mutableCopy];
  }
  
  return nil;
}
//存储数据到指定文件
+(BOOL) storageDataToFile:(NSData *)data fileName:(NSString *)fileName{
  //保存数据到指定文件中
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  if([fileManager createFileAtPath:fileName contents:data attributes:nil]){
    return YES;
  }else{
    return NO;
  }
}
//删除文件
+(void) deleteFile:(NSString *)fileName{
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  NSError *error;
  [fileManager removeItemAtPath:fileName error:&error];
}
//获取今天的日期
+(NSString *) fetchTodayDate{
  NSDate *currentDate = [NSDate date];
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
  return [dateFormatter stringFromDate:currentDate];
}
//获取昨天的日期
+(NSString *) fetchYesterdayDate{
  NSDate *yesterdayDate = [NSDate dateWithTimeIntervalSinceNow:-(24 * 60 * 60)];
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
  return [dateFormatter stringFromDate:yesterdayDate];
}
//获取前天的日期
+(NSString *) fetchYesterdayBeforeDate{
  NSDate *yesterdayDate = [NSDate dateWithTimeIntervalSinceNow:-(2 * (24 * 60 * 60))];
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
  return [dateFormatter stringFromDate:yesterdayDate];
}
//获取存储文件的数据
//创建文件
//创建目录
+(NSString *) createDirectory:(NSString *)directoryName{
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  NSError *error;
  if(![fileManager fileExistsAtPath:directoryName]){
    [fileManager createDirectoryAtPath:directoryName
        withIntermediateDirectories:YES
                attributes:nil
                   error:&error];
    if(error == nil){
      return directoryName;
    }else{
      return directoryName;
    }
  }else{
    return directoryName;
  }
}
//删除文件
+(void) removeFile:(NSString *)filePath{
  NSError *error;
  
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  if([fileManager fileExistsAtPath:filePath]){
    [fileManager removeItemAtPath:filePath error:&error];
  }
  if(error){
    NSLog(@"error = %@",error);
  }
}
//删除目录
+(void) removeDirectory{
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  NSString *documentsPath = [paths objectAtIndex:0];
  NSString *removeDirectoryPath = [documentsPath stringByAppendingPathComponent:[self fetchYesterdayBeforeDate]];
  NSError *error;
  
  NSFileManager *fileManager = [[NSFileManager alloc] init];
  if([fileManager fileExistsAtPath:removeDirectoryPath]){
    [fileManager removeItemAtPath:removeDirectoryPath error:&error];
  }
  if(error){
    NSLog(@"error = %@",error);
  }
}
@end
StorageData.h
//
// StorageData.h
// xunYi7
//
// Created by david on 13-6-28.
// Copyright (c) 2013年 david. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface StorageData : NSObject<NSURLConnectionDataDelegate, NSURLConnectionDelegate>
+(NSMutableData *)remoteFetchData:(NSString *)dataUrl;
+(NSMutableData *)localFetchData:(NSString *)dataUrl;
+(void) saveUploadImage:(UIImage *)image withName:(NSString *)imageName;
+(NSString *) uploadImage:(UIImage *)image withName:(NSString *)imageName;
+(NSString *) fetchUploadImagePath;
+(NSString *) fetchUploadImagePath:(NSString *)imageName;
+(void) removeUploadImage:(UIImage *)image withName:(NSString *)imageName;
+(NSString *)isFileExists:(NSString *)fullpath;
+(void) removeFile:(NSString *)filePath;
@end
© 版权声明
本文刊载的所有内容，包括文字、图片、音频、视频、软件、程序、以及网页版式设计等部门来源于互联网，版权均归原作者所有！本网站提供的内容服务于个人学习、研究或欣赏，以及其他非商业性或非盈利性用途，但同时应遵守著作权法及其他相关法律的规定，不得侵犯本网站及相关权利人的合法权利。
联系信息：邮箱aoxolcom@163.com或见网站底部。
THE END
IOS
# 字符串# 应用程序# Objective-C# UTF8# 数据存储# Component
喜欢就支持一下吧
点赞15 分享
子博兄的头像-华尔子博-奥夏网
HaoSQL-MySQL(SQL数据库一键安装包) V5.7免安装绿色版-华尔子博-奥夏网
HaoSQL-MySQL(SQL数据库一键安装包) V5.7免安装绿色版
HaoSQL-MySQL(SQL数据库一键安装包) V5.7免安装绿色版
3年前 2905
实现Linux+Windows双系统启动的方法详解-华尔子博-奥夏网
实现Linux+Windows双系统启动的方法详解
实现Linux+Windows双系统启动的方法详解
3年前 1601
PLSQL Developer 64位 11.0.4.1788中文汉化版-华尔子博-奥夏网
PLSQL Developer 64位 11.0.4.1788中文汉化版
PLSQL Developer 64位 11.0.4.1788中文汉化版
3年前 1507
电脑BIOS启动项怎么设置？bios设置启动项详解-华尔子博-奥夏网
电脑BIOS启动项怎么设置？bios设置启动项详解
电脑BIOS启动项怎么设置？bios设置启动项详解
1年前 1501
酒菜淡薄，招待不周，孝子孝孙磕头，磕头!-华尔子博-奥夏网
酒菜淡薄，招待不周，孝子孝孙磕头，磕头!
酒菜淡薄，招待不周，孝子孝孙磕头，磕头!
3年前 1005
土味情话大全，不经意的表白又坑人套路话大全-华尔子博-奥夏网
土味情话大全，不经意的表白又坑人套路话大全
土味情话大全，不经意的表白又坑人套路话大全
3年前 871
相关推荐
评论 抢沙发

请登录后发表评论

默认头像
鼠标移动事件默认文件系统默认数据库鳄鱼的故事高防服务器高防CDN高负载网络优化高负载的WEB应用高级的虚拟化管理高级数据压缩高级ETL工具高效编写Python代码高效的HTTP服务高效服务器高效PHP开发工具高性能计算机高性能的缓存高性能的CGI协议高性能消息传递高性能WEB服务器高性能 PHP 框架